Lifting and lowering structure of a long-legged chair

ABSTRACT

A long-legged chair includes a pair of seat supporting members, which are each connected to a respective one of front legs of the chair so as to slide up and down on the front legs; each seat supporting member has a hollow protruding portion thereon, which has a hole facing and adjacent to a corresponding front leg, and which has a button received therein and pivoted thereto; each button has a pressed portion and an inserted portion passed through a corresponding said hole so as to be received in one of the recessed portions in order for the seat supporting members to be firmly held by the front legs; when the buttons are pressed at the pressed portions, the inserted portions will be out of the recessed portions of the front legs, and in turn the seat supporting members are allow to slide on the front legs to adjust height.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a lifting and lowering structure of a long-legged chair, more particularly one, which is relatively easy to operate for adjusting the height of the seat.

2. Brief Description of the Prior Art

Babies and little children don't have enough height or ability to act independent therefore adults sometimes have to seat babies and little children in long-legged chairs. Most of such chairs can be folded with front and rear legs thereof being close together to be easy to store and carry. And, because little children grow taller very rapidly, such chairs should be equipped with height-adjustable seats for suiting little children at different ages.

Referring to FIGS. 7 and 8, a currently existing long-legged chair includes a pair of front legs 91, a pair of rear legs 92 each pivoted to a respective one of the front legs 91, a pair of seat supporting members 93, and a seat 94 joined to the seat supporting members 93. The seat supporting members 93 are each fitted on a respective one of the front legs 91 so as to slide over the front legs 91. The seat 94 can be joined to the seat supporting members 93 by any fastening means that allows the seat 94 to be easily fitted to/separated from the seat supporting members 93. Furthermore, the seat supporting members 93 each have a knob 95 fitted thereon, which includes a handle part 951, and a bolt part 952 with outer threads. And, the front legs 91 have several securing holes 911 thereon, which allow the bolt parts 952 of the knobs 95 to be passed into so as to secure the seat supporting members 93 after the seat supporting members 93 are adjusted to a proper height.

The above structure has a disadvantage: the knobs 95 have to be passed into the securing holes 911 and turned after the seat supporting members 93 have been adjusted. Consequently, it takes relatively much time and labor to operate such a long-legged chair.

SUMMARY OF THE INVENTION

Therefore, it is a main object of the present invention to provide an improvement on a lifting and lowering structure of a long-legged chair, which is easy to operate.

A lifting and lowering structure of a long-legged chair according to an embodiment of the present invention includes a pair of seat supporting members, which are each connected to a respective one of front legs of the chair so as to slide up and down over the front legs; each seat supporting member has a hollow protruding portion thereon, which has a hole facing and adjacent to a corresponding front leg, and a button received therein and pivoted thereto. Each button has a pressed portion and an inserted portion passed through a corresponding said hole so as to be received in one of the recessed portions in order for the seat supporting members to be firmly held on the front legs. Furthermore, angle between each button pressed portion and a corresponding inserted portion is blunt; thus, downward force exerted on the seat supporting members will be passed on to the font legs to increase the moment of force, thus making the buttons further passed into and tightly pressed against the recessed portions. When the buttons are pressed at the pressed portions, the inserted portions will be out of the recessed portions of the front legs, and in turn height of the seat supporting members can be adjusted.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be better understood by referring to the accompanying drawings, wherein:

FIG. 1 is a perspective view of the present invention,

FIG. 2 is a fragmentary exploded perspective view of the present invention,

FIG. 3 is a side view of the present invention,

FIG. 4 is a sectional view of the present invention, taken when the button is partly received in one recessed portion,

FIG. 5 is a sectional view of the present invention, taken when the button is apart from the recessed portions,

FIG. 6 is a side view of the present invention, taken after the seat is adjusted in height,

FIG. 7 is a perspective view of the prior art, and

FIG. 8 is a partial sectional view of the prior art.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to FIGS. 1 to FIGS. 6, a preferred embodiment of a long-legged chair of the present invention includes a pair of front legs 1, a pair of rear legs 2, a pair of seat supporting members 3, a seat 4, and casters 5.

The front legs 1 each have several recessed portions 12 spaced apart on a first side thereof. The rear legs 2 are pivoted to respective ones of the front legs 1. The seat supporting members 3 are each connected to a respective one of the front legs 1 so as to slide over the corresponding front leg 1. The seat 4 is joined to the seat supporting members 3 in a separable manner. The front legs 1 are further coupled with a transverse rod 11 so as to be secured together. The rear legs 2 are coupled with a transverse rod 21 so as to be secured together. The casters 5 are each connected to a respective one of the front and the rear legs 1 and 2.

The seat supporting members 3 each includes a lateral plank part 31, and a sliding sleeve 32 securely joined to the lateral plank part 31. Furthermore, the seat supporting members 3 are coupled and secured together with a transverse rod 311, which will help support the seat 4 when the seat 4 is supported by the seat supporting members 3. The sliding sleeves 32 are positioned around the corresponding front legs 1 so that the seat supporting members 3 can slide up and down along the front legs 1 together. Armrests 33 are fitted to respective ones of the lateral plank parts 31 of the seat supporting members 3. The lateral plank parts 31 is made so as to allow the seat 4 to be easily fitted thereto and easily separated therefrom.

The seat supporting members 3 each have a hollow protruding portion 61. And, the hollow protruding portions 61 each have a button 62 received therein and pivoted thereto, and a hole 611 facing the first side of the corresponding front leg 1, on which the recessed portions 12 are formed. The buttons 62 each have a pressed portion 621, and an inserted portion 622 below the pressed portion 621 and facing the hole 611 of the corresponding hollow protruding portion 61, and are each pivoted at a proper portion thereof to the corresponding hollow protruding portion 61 by means of a pin 63, which can be a rivet; the pressed portions 621 of the buttons 62 are rectangular flat plate-shaped, and have saw teeth shaped portions 6211 for slip-prevention. The buttons 62 are each biased by means of an elastic element 64, which is interposed between an inward side of its pressed portion 621 and an inner side of the hollow protruding part 61, such that the buttons 62 are each received in one of the recessed portions 12 of a corresponding front leg 1 at the inserted portion 622 thereof so as to hold the seat supporting members 3 in position.

An angle between each one of the pressed portions 621 and the corresponding inserted portion 622 is blunt. Referring to FIG. 4, the elastic elements 64 will provide a moment of force so as to make the inserted portions 622 of the buttons 62 further pass into the recessed portions 12 of the front legs 1 after the inserted portions 622 are received in the recessed portions 12. Furthermore, downward force exerted on the seat supporting members 3 will be passed on to the font legs 1 to increase the moment of force, thus making the buttons 62 further passed into and tightly pressed against the recessed portions 12 of the front legs 1 so as to make the seat supporting members 3 firm on the front legs 1.

Referring to FIGS. 5 and 6, the seat supporting members 3 will be adjustable in height after the pressed portions 621 of the buttons 62 are pressed in order for the inserted portions 622 to be out of the recessed portions 12 of the font legs 1; after the seat supporting members 3 are lifted/lowered to next recessed portions 12, the buttons 62 will be automatically inserted into the recessed portions 12 of the front legs 1 again to make the seat supporting members 3 firm on the front legs 1. 

1. A lifting and lowering structure of a long-legged chair, comprising a pair of front legs, the front legs each having a plurality of recessed portions thereof; a pair of rear legs pivoted to respective ones the front legs, a pair of seat supporting members, the seat supporting members being each connected to a respective one of the front legs so as to slide over the front legs; and a seat joined to the seat supporting members, each of the seat supporting members having a hollow protruding portion thereon; each of the hollow protruding portions having a hole adjacent to a corresponding said front leg; each of the hollow protruding portions having a button received therein and pivoted thereto; each of the buttons having a pressed portion and an inserted portion; the inserted portions of the buttons each facing a corresponding said hollow protruding portion hole so as to be passed through said hole and received in one of the recessed portions of the front legs in order for the seat supporting members to be firmly held in position on the front legs; an angle between each of the pressed portions of the buttons and a corresponding said inserted portion being blunt; the buttons being capable of being pressed at the pressed portions to move the inserted portions out of the recessed portions of the front legs in order to allow the seat supporting members to slide on the front legs. 